ment, does not represent the continuing advances in space technology. There is a growing recognition that current and planned space programs, systems and technologies in support of the evolving space infrastructure are advancing the feasbility of the SPS, including more efficient solar cells, higher frequency microwave generators and rectifiers, lasers, robotic assembly, advanced launch systems and extravehicular activities on the Moon for resource processing. A gradual development of space power, at first for use on Earth, represents a growth path with definable values obtained from SPS development at various stages of technology readiness, demonstration of economic returns and definition of follow-on steps. Near-term activities, already underway, include projects to demonstrate power beaming in space and to supply beamed power to elements of the space infrastructure at first in low Earth orbit and for future manned bases on the Moon and Mars. Space activities should be directed not only to broadening our knowledge base through human exploration and increasing our understanding of the complex changes affecting the biosphere, but enabling us to access the bountiful space resources so that humanity can extend its reach beyond the Earth and achieve the transition to a truly global civilization to meet the hopes and aspirations of all people for a better life in harmony with the objectives of the U.N. Conference on the Environment and Development.
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